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Old 02-23-2010, 06:12 PM
gitnoob gitnoob is offline
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Join Date: Jun 2009
Location: Emerald City
Posts: 4,327

Originally Posted by martinedwards View Post
you have a top that is bigger than the sides...... and is free to resonate (ie. not attached to the sides) so you carve and sand til it resonates at a D. then you glue it to the sides and cut an inch off all the way round......

you want to guess what it'll resonate at, because I haven't got a clue!!
This is a bit different in that I'm looking at fully assembled guitars.

Today, I sang into three different guitars and measured the resonant frequency of the air cavity.

It was interesting in a few respects:

1) They all resonated strongly at certain pitches, and not at all for others.

2) A parlor resonated at B, one 000 at A sharp, and another 000 at D.

3) I like sound of the one that resonates at D the best.

4) It seems that the air cavity resonates at a lower octave than the open strings. I'm not sure if this is by design, but it seems to keep the sound fairly balanced across the strings.

Question: when I sing into the guitar and cause it to resonate, is it resonating at its Helmholtz frequency? I.e., is it just the air that's getting excited?

I assume that shaving the braces won't have any effect on this resonance frequency.

gits: good and plenty
chops: snickers
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